The rust problem is totally unacceptable and quite shocking. Rotten metal remains rotten. Where else can there be rust? I'd be very unhappy if I was presented with a new car with this problem. I'd reject it.
Now as far as the overall fit and finish is concerned, the Munich made F30s I have encountered in the UK have a fit and finish second to none, and trust me, I am extremely fussy. I have been through F30s with a tooth comb and was more than satisfied with the car in every way. The car was far superior to comparable Audis and better than my Mercedes C Class 350 CDI Sport saloon. My other car which is a Mk6 Golf GTI, also felt a class below in quality.
I wonder what has gone wrong with the cars the above posters have come across? I'd also be very discouraged.
Present: Superman 330d sDrive M Sport + Toys (Auto Car: 0-60 in 5.5s, 0-100 in 14.2s, 30-70 in 5.1s)
Ordered: Red Tornado Golf 7R 5 Dr, DSG + Toys (Top Gear: 0-60 in 4.5s, 0-100 in 11.5s, 30-70 in 4.0s)